View All num of num See all Photos IBM www.ibm.com Engaged Employer Overview Reviews Salaries Interviews Jobs Photos Benefits 14k Reviews 34k Salaries 2.6k Interviews 20k Jobs Follow Add Interview Follow Add Interview Interview Question Intern Interview IBM I have a scale and 7 balls. 1 ball is heavier than all the rest. How do I determine the heaviest ball with only 3 possible weighing attempts? Tags: See more , See less 8 Answer Add Tags Answer Interview Answer 1 Answer ▲ 0 ▼ It only takes two attempts. Weigh six balls - three on each side of the balance. If they balance, then the 7th ball is the heaviest. If they don't balance, take two balls from the heavy side. If they balance, then the heavier ball is the one you didn't weigh. If they don't, then the heavier ball will be the one that tips the scale. Michael Kraft on Mar 21, 2015 Interviews > Intern > IBM Add Answers or Comments To comment on this, Sign In or Sign Up.